Plans to transport 1 million rail passengers a year between Frankfurt and London are back on track as an independent report prepares to back German rail operator Deutsche Bahn in a row over Channel tunnel safety.

DB's ambition to launch a Teutonic Eurostar has been threatened by French objections to the state-of-the-art rolling stock it plans to use in the tunnel. David Cameron and Angela Merkel, the German chancellor, are believed to have raised their concerns about the row with the French government, amid fears that it will hinder the growth of pan-European high speed rail services.

However, this week the European Railways Agency is expected to endorse new trains manufactured by Siemens, the German industrial group, which beat France's Alstom to a coveted Eurostar rolling stock order. The order for inter-city express (ICE) trains, which will also be used by DB in its Frankfurt-to-London service, met with opposition on the other side of the tunnel. The French government supported Alstom's argument that the Siemens trains are unsafe because their motors are distributed under each carriage. The row split the Anglo-French intergovernmental commission (IGC) on channel tunnel safety, which resulted in the ERA being asked for a second opinion.

Sources close to the process said the ERA is likely to recommend that so-called "distributed power" trains can be used in the tunnel, clearing the way for the ICE carriages. It is also understood that the report will not raise objections to DB's proposal to couple two separate trains – a proposal that raised safety concerns in some quarters. As a consequence, the IGC is expected to come under further pressure to allow the ICE trains to operate through the tunnel.

DB plans to run 200mph trains from London to Frankfurt, Cologne, Amsterdam and Rotterdam from December 2013, expanding the rail market between Britain and the continent by 10% by carrying 1 million passengers a year.